Multipump and quasistroboscopic back-action evasion measurements for resonant-bar gravitational-wave antennas

Journal Article · Sun Mar 15 00:00:00 EST 1992 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.45.1869· OSTI ID:7278153

Marchese, L E; Bocko, M F ^[1]; Onofrio, R ^[2]

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1. Department of Electrical Engineering, University of Rochester, Rochester, New York 14627 (United States)
2. Istituto Nazionale di Fisica Nucleare, Sezione di Roma, piazzale Aldo Moro 2, Roma 00185 (Italy)

A generalization of the back-action evasion (BAE) measurement technique, which we call {ital multipump} back-action evasion, has been demonstrated with a parametric electromechanical transducer similar to ones which are used on resonant-bar gravitational-wave detectors. The benefit of a BAE measurement is that the fluctuating back-action force of the transducer readout circuit acting on a test mass is squeezed, i.e., reduced in one of the quadrature phases of the test mass, thus improving the sensitivity for the detection of weak forces. The multipump BAE technique affords even greater noise squeezing than the BAE technique. Measured back-action noise squeezing factors are in quantitative agreement with the predictions of the model of a multipump BAE measurement. Using this system we have also demonstrated a quasistroboscopic position measurement which is a limiting case of a multipump back-action evasion measurement when the number of pumps becomes large. The multipump BAE technique may be used to further improve the sensitivity of resonant-bar gravitational-wave antennas.

• OSTI ID: 7278153
• Journal Information: Physical Review, D (Particles Fields); (United States), Vol. 45:6; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
GRAVITATIONAL WAVE DETECTORS
ANTENNAS
HARMONIC OSCILLATORS
SCHROEDINGER EQUATION
WAVE FUNCTIONS
DIFFERENTIAL EQUATIONS
ELECTRICAL EQUIPMENT
ELECTRONIC EQUIPMENT
EQUATIONS
EQUIPMENT
FUNCTIONS
MEASURING INSTRUMENTS
OSCILLATORS
PARTIAL DIFFERENTIAL EQUATIONS
RADIATION DETECTORS
WAVE EQUATIONS
661310* - Relativity & Gravitation- (1992-)